GST Departmental Audit (Sec 65)

GST Departmental Audit (Sec 65): The 2026 Taxpayer's Complete Playbook

A Section 65 audit under the CGST Act, 2017 is a formal, on-record examination of your books, returns, and transactions by a GST officer authorised by the Commissioner. In FY 2026-27, GSTN's risk-scoring engine, e-invoice data matching, and cross-validation against the Annual Information Statement (AIS) have made these audits both more targeted and more technically demanding. You will receive Form GST ADT-01 as your first formal signal. What you do in the 15 working days before the audit begins — and what you have been doing every month before that — determines whether it closes cleanly or escalates to a Section 73 or Section 74 demand with interest and penalty.

Who Gets Selected: The Risk Signals GSTN Is Watching in FY 2026-27

Any registered person can be selected for a Section 65 audit regardless of turnover, age of registration, or business category. The CGST Act prescribes no minimum threshold. What has changed materially in 2026 is the sophistication of the selection process. Officers at the Audit Commissionerate now work from data-driven risk reports generated centrally by GSTN and cross-seeded with Income Tax data.

The signals that push a taxpayer up the risk queue include:

• High ITC-to-output-tax ratio: If your entity claims ₹90 of Input Tax Credit (ITC) for every ₹100 of output tax liability across consecutive quarters, the system flags this as anomalous against sector peers.
• GSTR-2B vs GSTR-3B gaps: Claiming ITC in GSTR-3B that is materially higher than what appears in GSTR-2B — especially after Section 16(2)(aa) made GSTR-2B the controlling document — is a top-ranked trigger. Even a 3–5% consistent gap draws attention.
• E-invoice and e-way bill mismatches: Invoice values reported through the Invoice Registration Portal (IRP) that do not reconcile with GSTR-1 B2B figures attract automated alerts. The system compares IRN-level data with GSTR-1 at the GSTIN level.
• Frequent GSTR-1 amendments: Repeated use of Amendment Tables 9A, 9B, and 9C in GSTR-1 signals post-facto adjustments and raises questions about the accuracy of the original reporting.
• AIS-GSTR cross-validation gaps: The Income Tax AIS now carries GST turnover data fed directly by GSTN. A material gap between AIS-reported GST turnover and the turnover declared in your Income Tax return for AY 2026-27 or AY 2027-28 can independently trigger a referral to the Audit Commissionerate.
• Sectoral risk profiling: Real estate developers (TDR, joint development arrangements), scrap dealers, e-commerce operators subject to TCS under Section 52, and metal traders are under heightened systemic review.
• Adverse findings in prior audit cycles: A Section 65 audit that resulted in a demand, even one currently under appeal, significantly raises the probability of a follow-on audit for the next financial year.

Being flagged by this system does not presume fraud or evasion. It signals that automated reconciliation has found something the system cannot resolve without human review. That framing matters when you construct your response.

ADT-01: The Intimation Notice, Your Statutory Rights, and the First 72 Hours

The audit formally begins when you receive Form GST ADT-01 — the intimation of audit. This is not a show-cause notice and not a demand. It is a statutory intimation that an audit has been ordered for a specified period.

Statutory minimum lead time: ADT-01 must be served at least 15 working days before the audit commences. This is a right under Rule 101(2) of the CGST Rules, 2017. If an officer attempts to begin audit proceedings before this window has elapsed, you can — and should — formally object in writing.

Completion timeline: Once the audit commences, it must be completed within three months. The Commissioner can extend this by a further six months by recording reasons in writing. In practice, multi-location businesses or large entities with voluminous records routinely receive extensions, making the effective window nine months.

Venue of audit: The audit can be conducted at your registered principal place of business or, if the officer directs, at the department's office with specific documents called for in writing.

What to do in the first 72 hours after receiving ADT-01:

1. Record the date of service accurately — this starts your 15-working-day clock. Make a written note and preserve the envelope or email header.
2. Read the audit period specified in ADT-01. Identify which financial years are in scope and confirm which GSTR-1, GSTR-3B, GSTR-9, and GSTR-9C returns fall within the period.
3. Assign a senior internal coordinator as the single designated point of contact for all document requests. Responses that come from different people with different explanations for the same transaction create credibility problems.
4. Engage your GST practitioner or tax counsel immediately. A Section 65 audit is a legal proceeding. Informal statements made to auditors — even casual explanations in the margin of a working sheet — can become admissions that foreclose defences later.
5. Begin assembling the core document set (detailed in the next section) in a structured folder — physical or digital — organised by return period.
6. Do not produce documents beyond the scope of ADT-01. Answer exactly what is asked, completely and accurately. Do not volunteer internal e-mails, draft opinions, or management discussion notes that expand the audit universe beyond what was requested.

Records the Auditor Will Call For: The Complete Checklist

Section 65(2) of the CGST Act gives the authorised officer the power to examine records, verify returns, and check the correctness of ITC availed, turnover declared, and tax paid. The document demand typically covers:

Financial records:

• Trial balance, profit and loss account, and balance sheet for the period under audit
• Bank statements for all operating accounts — current, overdraft, foreign currency (EEFC)
• Ledger-level detail for output GST liability accounts, ITC accounts, and purchase accounts

GST return records:

• Filed copies of GSTR-1, GSTR-3B, GSTR-9, and GSTR-9C for each financial year in scope
• GSTR-2A and GSTR-2B downloads (month-wise) with your internal reconciliation worksheet
• E-invoice summary reports from the IRP or your ERP with IRN-wise data
• E-way bill summary reports from the Government's e-way bill portal (GSTIN-wise)

Transaction-level records:

• Sales invoices, debit notes, and credit notes — both B2B and B2C
• Purchase invoices with supplier GSTIN cross-checked against GSTR-2B appearance
• Import documents: Bills of Entry, IGST paid at customs, and the ITC availed against each
• Reverse Charge Mechanism (RCM) self-invoices and payment records for import of services, Goods Transport Agency (GTA), security services, and director remuneration where applicable

ITC-specific working papers:

• Rule 42 reversal computation — common ITC reversed proportionately for exempt versus taxable supplies
• Rule 43 reversal computation for capital goods used partly for exempt supplies
• Section 17(5) blocked credit register — a document listing all ineligible inputs identified during the period, with amounts reversed, is something few taxpayers maintain and every auditor looks for
• Job work challans under Section 143 — goods sent for job work with dispatch dates (the 1-year limit for inputs, 3-year limit for capital goods)

Contracts and agreements:

• Customer rate cards and supply agreements, particularly where classification between goods and services or between different GST rates is a question
• Works contract agreements where the composition of materials and labour affects the applicable rate
• Lease and rental agreements where GST has been charged or ITC has been claimed on rent paid

Organise these materials by financial year and by category before the first audit sitting. An officer who must repeatedly wait for documents draws adverse inferences about the overall quality of your records — and those inferences shape the tone of the entire proceeding.

The Five Issues That Drive 80% of Section 65 Demands

Patterns from Section 65 audit outcomes consistently show five categories generating the large majority of demands and recoveries:

1. ITC Not Appearing in GSTR-2B — Section 16(2)(aa)

After the Finance Act 2022 amendment, ITC is available only to the extent reflected in GSTR-2B. If you claimed ₹50 lakh of ITC in a financial year but ₹8 lakh of this did not appear in GSTR-2B because suppliers filed late, under-reported, or did not file at all, that ₹8 lakh is the first line-item on the audit demand sheet. Interest under Section 50 at 18% per annum runs from the date of excess claim to the date of reversal.

2. Blocked Credits Under Section 17(5)

Section 17(5) blocks credit on specific categories regardless of business purpose. The most frequently found incorrect claims include: motor vehicles and services related to their maintenance (the exceptions for vehicles with seating capacity of more than 13 passengers, motor vehicle dealers, and transport businesses are narrow and often misapplied); food, beverages, and outdoor catering (this includes pantry services in offices and meals provided to factory workers); club memberships; health and fitness services; and expenses incurred on Corporate Social Responsibility (CSR) under the Companies Act 2013 — confirmed as blocked by CBIC Circular No. 172/04/2022-GST.

3. Incorrect HSN Code or Classification — Short Tax

An incorrect Harmonised System Nomenclature (HSN) code resulting in a lower GST rate is a clean audit finding. The auditor reclassifies the supply and raises the differential tax, interest from the date of supply, and penalty. This is particularly common in engineering components, composite supplies (a combination of goods and services with a single price), and works contracts where the split between materials and services is contested.

4. RCM Non-Compliance

RCM liability on import of services (taxable as IGST under the Integrated Goods and Services Tax Act, 2017), GTA services at 5%, security services received from unregistered persons, and director remuneration classified as supply of services by the director to the company under Notification No. 13/2017-Central Tax (Rate) is frequently found to be partially or fully missed. The demand covers tax from the date liability arose, interest from the same date, and penalty.

5. Interest on Delayed Cash Payment — Section 50

Even where the net tax liability after ITC is eventually settled, if the cash component of GST was paid after the due date of GSTR-3B, interest at 18% per annum accrues from the due date to the actual date of payment. This is a mathematically clean demand: no subjectivity, no classification dispute, just days multiplied by rate multiplied by amount.

Worked Example: How Two Common Findings Become a ₹15 Lakh Demand

Consider a manufacturing company audited for FY 2024-25 under Section 65.

Finding 1 — GSTR-2B mismatch:

• ITC claimed in GSTR-3B across the year: ₹1,20,00,000
• ITC reflected in GSTR-2B: ₹1,12,00,000
• Excess ITC not in GSTR-2B: ₹8,00,000
• Average date of claim: October 2024
• Audit demand raised: April 2026 (18 months later)

Tax demand: ₹8,00,000 Interest under Section 50 @ 18% p.a. for 18 months: ₹8,00,000 × 18% × (18/12) = ₹2,16,000 Penalty under Section 73 (non-fraud) @ 10%: ₹80,000 Sub-total Finding 1: ₹10,96,000

Finding 2 — Section 17(5) blocked credit on food and catering:

• ITC incorrectly claimed on staff canteen and outdoor catering: ₹3,00,000 (across the year)
• Same 18-month interest period applies

Tax demand: ₹3,00,000 Interest @ 18% for 18 months: ₹3,00,000 × 18% × 1.5 = ₹81,000 Penalty @ 10%: ₹30,000 Sub-total Finding 2: ₹4,11,000

Total audit demand from two routine findings: ₹15,07,000

The GSTR-2B gap could have been eliminated by monthly reconciliation and supplier follow-up — or reversed in the GSTR-9 annual return at zero interest cost. The Section 17(5) finding could have been avoided with a quarterly blocked-credit review. Neither finding required extraordinary compliance capability. Both required a structured monthly routine.

Common Mistakes That Turn a Routine Audit Into a Costly Demand

Producing Unsolicited Documents

When the auditor asks for purchase invoices, provide purchase invoices — and only purchase invoices. Do not volunteer internal e-mails that discuss whether a particular ITC claim was aggressive, draft legal opinions flagging uncertain positions, or board presentations discussing tax risk. Voluntary production expands the audit universe in ways that are difficult to reverse.

Inconsistent Explanations Across Personnel

Auditors may interview the accounts executive, the CFO, and the tax consultant on the same transaction on different days. If the three give materially different explanations for why a particular ITC was claimed or why a supply was classified at a particular rate, credibility collapses. Brief everyone on the agreed factual narrative — not the legal argument, but the facts — before the audit begins.

Not Reconciling GSTR-9 With the Trial Balance Before ADT-01 Arrives

The GSTR-9 annual return is the auditor's primary reference document. Any discrepancy between GSTR-9 outward supply figures and your audited profit and loss turnover, or between GSTR-9 ITC claimed and ITC figures in your ledger, is the first line of questioning. If you discover and can explain these gaps yourself — before the auditor asks — you control the narrative. If you discover them because the auditor pointed them out, you are already on the back foot.

Leaving GSTR-2B Gaps Unreconciled Because Overall Tax Is Paid

Many taxpayers accept residual GSTR-2B mismatches because their ITC pool is large enough that the net liability is still zero. This logic fails the Section 16(2)(aa) test: the law restricts ITC to what is in GSTR-2B regardless of whether you could otherwise afford the tax. A gap that costs nothing today accumulates interest at 18% per annum until the audit finds it.

Treating the ADT-01 as a Paperwork Exercise

Assigning a junior accountant without senior oversight, not engaging a GST practitioner, and skipping a pre-audit internal review is the single most expensive error a business can make when facing Section 65. The audit is a legal proceeding with enforceable outcomes and time-bound appeal rights. Treat it accordingly from day one.

ADT-02: After the Audit — What the Report Says and What You Can Do

On conclusion of the audit, the officer issues Form GST ADT-02 communicating findings, observations, and the amount of tax short-paid or ITC incorrectly availed, if any. ADT-02 is not a demand notice. It is the audit conclusion document.

What happens next:

Option 1 — Voluntary payment before Show-Cause Notice (SCN): If you accept the findings, you can pay the tax and interest. If paid before an SCN is issued under Section 73, the penalty is reduced to 15% of the tax amount. This is a significant concession. If paid within 30 days of the SCN under Section 73, the penalty is 25%. In a fraud or wilful misstatement case under Section 74, the equivalent pre-SCN penalty is 15% but the tax itself is often computed with greater aggression.

Option 2 — Contest the findings: Where you dispute the audit conclusions, the officer issues a Show-Cause Notice under Section 73 (no fraud, no wilful misstatement — limitation period three years from the due date of the annual return for the year in question) or Section 74 (fraud, wilful misstatement, or suppression of facts — five-year limitation period). You file a written reply, attend a personal hearing, and the Proper Officer issues a speaking order.

Appeal route after an adverse order: Appellate Authority (Commissioner — Appeals) → GST Appellate Tribunal (GSTAT, now being constituted across the country) → High Court on questions of law → Supreme Court.

Calculate the tax plus interest plus the 15% reduced penalty explicitly before deciding whether to contest or voluntarily settle. In many cases involving uncertain classification or timing disputes, the voluntary payment route under Section 73 at 15% penalty is arithmetically preferable to two to three years of litigation costs.

Section 65 vs Sections 66, 61, and 67: The Gradient You Must Understand

Conflating these four proceedings is a costly mistake. Each has different legal powers, timelines, conducting authorities, and appropriate taxpayer responses.

Section 61 (Scrutiny of Returns): You receive Form ASMT-10 asking you to explain a specific discrepancy in your returns. Respond via Form ASMT-11. If the explanation is accepted, the officer closes with Form ASMT-12. A timely, documented, and well-supported ASMT-11 response almost never escalates to a Section 65 audit. Delay or a cursory response does.

Section 66 (Special Audit): Ordered when the technical complexity of the matter — related-party pricing, complex valuation under Section 15, or intricate multi-state ITC — makes normal departmental audit insufficient. A Chartered Accountant or Cost Accountant is appointed at government expense. The 90-day completion period (extendable by another 90 days) applies. Findings feed the same Section 73/74 framework but carry greater technical authority because the auditor is an independent professional.

Section 67 (Inspection, Search, and Seizure): An entirely different species of proceeding. Intelligence-driven, frequently without advance notice, with powers to seal premises, seize goods and documents, and provisionally attach bank accounts under Section 83. If you receive an unannounced visit from officers identifying themselves as acting under Section 67, invoke your right to legal counsel immediately. Do not make oral admissions or sign panchnamas without professional review. Do not confuse this with a Section 65 audit team that arrives for a scheduled examination.

Staying Audit-Ready Year-Round: A Practical Operating Rhythm

The businesses that move through Section 65 audits with minimal disruption and clean outcomes are not fortunate — they run a structured internal compliance routine. The following is a realistic operating calendar:

Monthly discipline:

• Download GSTR-2B by the 14th of the following month and reconcile it against your purchase register before filing GSTR-3B. Document every mismatch: the invoice number, supplier GSTIN, reason for absence in GSTR-2B (supplier not filed, under-reported, or GSTIN error), and the action taken — whether follow-up was initiated or reversal was decided.
• Review each month's purchases for Section 17(5) blocked categories. Flag and reverse any inadvertently availed blocked credit before the GSTR-3B filing deadline.
• Confirm RCM liability is computed and self-invoiced for all applicable categories in the month.

Quarterly discipline:

• Run Rule 42 and Rule 43 reversal calculations if your business has both taxable and exempt supplies, or capital goods in use for multiple purposes.
• Reconcile e-way bill data against GSTR-1 data for the quarter. Investigate value differences above ₹1,00,000 at the invoice level.
• Review job work register: have any inputs or capital goods sent to job workers crossed the 1-year or 3-year limits under Section 143? If yes, they are deemed to be sold and tax is payable.

Annual discipline (before filing GSTR-9):

• Reconcile GSTR-9 outward supply turnover with the audited profit and loss account. Document each difference — advances, credit notes, exempted supplies — in a reconciliation note that you retain permanently.
• Reconcile total ITC claimed in GSTR-3B across the year against cumulative GSTR-2B figures. Reverse the net gap or carry a documented legal position if you believe the ITC is valid despite the GSTR-2B gap.
• Log in to the Income Tax e-filing portal, navigate to AIS, and compare the GST turnover figure shown there with what you filed in GSTR-9. A material gap will be visible to both departments.
• Retain your GSTR-9C reconciliation working papers even if your turnover is below the mandatory GSTR-9C filing threshold. The reconciliation discipline protects you if you are selected for audit.

Key Takeaways

• ADT-01 must arrive at least 15 working days before audit commencement. Note the service date, use the window to assemble records and brief stakeholders, and engage your GST practitioner before the first sitting — not after.
• GSTR-2B is now the controlling document for ITC under Section 16(2)(aa). ITC not appearing in GSTR-2B is prima facie inadmissible. Monthly reconciliation is the only sustainable way to manage this exposure — an annual clean-up costs interest at 18% per annum on every rupee gap that remained open.
• Section 17(5) blocked credit review must be quarterly. Motor vehicles, food and catering, club memberships, and CSR spend are clean, document-supported audit targets. Maintain a dedicated blocked-credit register with amounts and reversal dates.
• Voluntary payment before the Show-Cause Notice under Section 73 attracts only a 15% penalty on the tax demanded — compared to 100% in fraud cases under Section 74 and the full costs of litigation if the order is contested. Run the numbers before deciding on strategy.
• ADT-02 is the findings document, not the demand notice. It is the window during which voluntary payment at reduced penalty is available before formal adjudication is initiated under Section 73 or 74.
• Section 65 audit is fundamentally different from Section 67 inspection. An audit team has no seizure powers. An inspection under Section 67 does. Know immediately which proceeding you are facing and respond accordingly.
• Year-round compliance routine eliminates most audit findings before they arise. The worked example in this article — a ₹15 lakh demand — would have been reduced to near-zero by a monthly GSTR-2B reconciliation discipline and a quarterly Section 17(5) review. Audit-ready records are cheaper to maintain than audit demands are to defend.